DEFINITION OF DECOLLEMENT

A type of detachment fault system that is

characterized by different styles of deformation above and

below the fault plane. They are typically associated with

large-scale thrusting and folding of the thrust sheet overlying

the fault, with the rocks underneath the fault remaining relatively

undeformed. Decollement faults originate as relatively

flat lying but may become rotated to steeper attitudes in progressive

or younger deformation events. Beautifully exposed

decollement faults are known from the American and Canadian

Rockies, the Alps, and many other mountain belts

around the world.

See also STRUCTURAL GEOLOGY.

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